The advantage of using native lib is that you avoid fork/exec cost, and I guess during the lifetime of NutchFS there would be quite a few calls to the native utilities... I'm afraid this would give a poor performance. Also, on different Unixes (and on Cygwin) command-line parameters for many FS-specific utilities are different.
I still would like to try to first make it work with just shell commands. Yes, it will be slower than native, but I don't think we should need to perform these operations so frequently that this will be a big issue. Command-line options could be an problem too, but let's give it a try first. If these are a problem, we could simply require that the GNU versions are used by, e.g., examining the output of 'mv --version' and 'df --version'. The GNU utils are the default on lots of Unix implementations, and will run on the rest.
Doug
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